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SN74LS123N Datasheet(PDF) 1 Page - Motorola, Inc |
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SN74LS123N Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 10 page 5-197 FAST AND LS TTL DATA RETRIGGERABLE MONOSTABLE MULTIVIBRATORS These dc triggered multivibrators feature pulse width control by three meth- ods. The basic pulse width is programmed by selection of external resistance and capacitance values. The LS122 has an internal timing resistor that allows the circuits to be used with only an external capacitor. Once triggered, the ba- sic pulse width may be extended by retriggering the gated low-level-active (A) or high-level-active (B) inputs, or be reduced by use of the overriding clear. • Overriding Clear Terminates Output Pulse • Compensated for VCC and Temperature Variations • DC Triggered from Active-High or Active-Low Gated Logic Inputs • Retriggerable for Very Long Output Pulses, up to 100% Duty Cycle • Internal Timing Resistors on LS122 SN54 / 74LS122 (TOP VIEW) (SEE NOTES 1 THRU 4) SN54 / 74LS123 (TOP VIEW) (SEE NOTES 1 THRU 4) NOTES: 1. An external timing capacitor may be connected between Cext and Rext/Cext (positive). 2. To use the internal timing resistor of the LS122, connect Rint to VCC. 3. For improved pulse width accuracy connect an external resistor between Rext/Cext and VCC with Rint open-circuited. 4. To obtain variable pulse widths, connect an external variable resistance between Rint/Cext and VCC. 14 13 12 11 10 9 1 2 3 4 5 6 8 7 VCC Rext/ Cext NC Cext NC Rint Q A1 A2 B1 B2 CLR Q GND CLR Q Q Rint 2 Rext/ Cext 1 Cext 1Rext/ Cext 14 13 12 11 10 9 1 2 3 4 5 6 7 16 15 8 VCC 1A 1Q 2Q 2B 2 CLR 2A 1B 1 CLR 1Q 2Q 2 Cext GND Q Q Q Q CLR CLR NC NO INTERNAL CONNECTION. SN54/74LS122 SN54/74LS123 RETRIGGERABLE MONOSTABLE MULTIVIBRATORS LOW POWER SCHOTTKY J SUFFIX CERAMIC CASE 620-09 N SUFFIX PLASTIC CASE 648-08 16 1 16 1 ORDERING INFORMATION SN54LSXXXJ Ceramic SN74LSXXXN Plastic SN74LSXXXD SOIC 16 1 D SUFFIX SOIC CASE 751B-03 J SUFFIX CERAMIC CASE 632-08 N SUFFIX PLASTIC CASE 646-06 14 1 14 1 14 1 D SUFFIX SOIC CASE 751A-02 |
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